As of this writing, the MultimediaWiki has catalogued just north of 100 video codecs. I believe these each to be legitimate, unique video codecs. I know that the original FourCC list has dozens upon dozens more FourCCs. However, my base criteria for adding a new codec is proof that it exists, either by a binary (or source code) codec module or by collected samples. There are a few codecs for which the MPlayer archive has samples but we only know their FourCCs. These include AVUI and ViVD. I know that binary codec modules exist in a number of web collections that would verify that some of those more obscure FourCCs exist. But many of the websites seem to be slow, inundated by pop-ups, and written in some kind of Cyrillic text. I don’t have the patience for any of that. But if you do, the Wiki could use your help.